2105661797 has 16 divisors (see below), whose sum is σ = 2196384960. Its totient is φ = 2017008000.

The previous prime is 2105661781. The next prime is 2105661821. The reversal of 2105661797 is 7971665012.

It is a cyclic number.

It is not a de Polignac number, because 2105661797 - 2⁴ = 2105661781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105663797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1524047 + ... + 1525427.

It is an arithmetic number, because the mean of its divisors is an integer number (137274060).

Almost surely, 2^2105661797 is an apocalyptic number.

It is an amenable number.

2105661797 is a deficient number, since it is larger than the sum of its proper divisors (90723163).

2105661797 is a wasteful number, since it uses less digits than its factorization.

2105661797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2084.

The product of its (nonzero) digits is 158760, while the sum is 44.

The square root of 2105661797 is about 45887.4906374275. The cubic root of 2105661797 is about 1281.7289861170.

The spelling of 2105661797 in words is "two billion, one hundred five million, six hundred sixty-one thousand, seven hundred ninety-seven".